The paper addresses four major "grades" of postconsumer recovered paper: old corrugated containers, office
papers (computer printout, white ledger, and sorted office paper), mixed paper, and old newspapers. The definitions for these
paper grades are as follows:
Old Corrugated Containers (OCC)
Used cardboard boxes.
Printout (CPO). White, groundwood-free papers used for printing computer-generated data. Typically are continuous,
serrated papers, with "tractor feed" strips on side. Have superior strength and printing surface to ledger papers.
White Ledger (WL). White, groundwood-free printing and writing papers such as copier paper,
laser printer paper, white lined tablet paper, and stationary.
Sorted Office Paper (SOP).
A selective mixture of papers typically generated in offices, comprised primarily of white ledger but including colored ledger,
carbonless forms, envelopes, and groundwood-free coated paper. (Note: The term "sorted" is based on the fact that
the acceptable mixture of papers must still be sorted from nonacceptable papers such as boxboard, cardboard, newspapers, magazines,
An extremely broad mixture of papers, with few unacceptable paper types. Includes
virtually all types of paper generated in offices, and a large percentage of papers generated in homes. Unacceptable paper
types typically include plastic-coated papers such as frozen food packages and paper towels/tissue.
Newspapers and other uncoated, unbound groundwood papers such as advertising fliers, election guides, and tax
*This information provided by the Integrated
Waste Management Boardhttp://www.ciwmb.ca.gov/Markets/StatusRpts/Paper.htm#Introduction